DMRG calculations on cylinders of width up to \(W=17\)  have been performed [1]}, [2]}, [3]}, [4]}, [5]}. (In some of these calculations, a small second-neighbor \(J^{\prime }\le 0.15J\)  has been applied.) These works consistently find a quantum disordered ground state with no sign of magnetic or valence bond crystalline order. This suggests a quantum spin liquid ground state. Unfortunately, there is disagreement on the nature of this spin liquid, e.g., whether it has a spin gap [3]} or a gapless Dirac spinon spectrum [5]}. The disagreements suggest that the long-range correlations may not yet be fully converged with respect to the bond dimension, and more extensive studies are needed to resolve the nature of the ground state.
